Your friends lives have developed in a different direction than yours. and newer parents will have a tendency to focus most of their time with the children - and with others in your group being in the same situation, yes, most of the social gatherings will be this type.
Sooner or later, they will be wanting to have the type of social outings they used to enjoy, so just bear with them for now. Many young parents go this route and find it nearly impossible to restart their own social lives.
I would suggest splitting your time with them and some other friends, or new ones, who still do the type of things you enjoy.